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Yes, the small bullseye bubbles are seldom accurately set on the mount. But, that does not make them useless as the error can be very easily calibrated out.
First step is to accurately level the top face of the tripod as mentioned already. Then set the mount onto the tripod. The bubble will settle at a point representing dead level for your mount. Use a permanent marker pen to mark this position. You now have a workable and accurate bubble level on your mount.
Of course these small bubble mounts are not as accurate as larger and better engineered levels. However, I find these sufficiently accurate, once calibrated, for levelling an alt-am mount.
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